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The volumes of gases H2,CH4,CO2 and NH3 ...

The volumes of gases `H_2,CH_4,CO_2` and `NH_3` adsorbed by 1gr of charcoal at 288K are in the order

A

`H_2gtCH_4 gt CO_2 gt NH_3`

B

`CO_2 gt NH_3 gt H_2 gt CH_4`

C

`NH_3 gt CO_2 gt CH_4 gt H_2`

D

`CH_4 gt CO_2 gt NH_3 gt H_2`

Text Solution

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The correct Answer is:
C
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Only the surface atoms in an adsorbent, play an active role in adsorption. These atoms posses some residual forces like vander Waal's forces and chemical forces. In the process of adsorption, weak adsorbate is substituted by strong adsorbate. Activated charcoal used in gas mask is already exposed to the atmospheric air, so the gases and water vapours in air are adsorbed on its surface. When the mask is exposed to chlorine atmosphere, the gases are displaced by chlorine. Porous and finely powdered solids, e.g., charcoal and Fuller's earth adsorb more as compared to the hard non-porous material. It is due to this property that the powdered characoal is used in gas masks. In general, easily liquefiable gases like CO_2, NH_3, Cl_2 , and SO_2 etc., are adsorbed to a greater extent than the elemental gases, eg., H_2, N_2, O_2, He , etc. Which of the following gases will be most easily adsorbed by the charcoal in the gas mask

Critical temperature of SO_2, N_2, NH_3 and CH_4 are 430 K, 126K, 406 K and 356 K. Arrange in the descending order of volume of these gases adsorbed per gram of charcoal.

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AAKASH SERIES-REVISION EXERCISE -SURFACE CHEMISTRY
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  2. Which are of the following is a case of adsorption?

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  3. The volumes of gases H2,CH4,CO2 and NH3 adsorbed by 1gr of charcoal a...

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  4. Which one of the following is not an application of adsorption ?

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  5. Which of the following is less than zero during adsorption?

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  16. Which electrolyte is least effective in causing coagulation of +ve fer...

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  17. The capacity of an ion to coagulate a colloidal sol depends on

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  18. Lyophilic sols are more stable than lyophobic sols because

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